This MS-900 practice question tests your understanding of describe cloud concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Adatum Corporation is a small business with 50 employees. They use Microsoft 365 Business Basic and SharePoint Online for document management. Employees frequently share files with external partners via email attachments. The CEO wants to reduce the risk of data leaks and ensure that shared files are protected even after they are sent. Which Microsoft 365 solution should Adatum implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Purview Message Encryption
Option A is correct because Microsoft Purview Message Encryption allows encrypting emails and attachments, and can restrict actions like forwarding. Option B is wrong because SharePoint external sharing controls access to SharePoint, not email attachments. Option C is wrong because DLP policies prevent sharing but do not protect after sending. Option D is wrong because sensitivity labels can be applied manually but do not automatically protect attachments in transit.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
SharePoint external sharing settings
Why it's wrong here
External sharing settings control access to SharePoint sites, not email attachments.
✗
Data Loss Prevention (DLP) policies
Why it's wrong here
DLP policies can block sharing sensitive data, but do not protect data after it is sent.
✗
Sensitivity labels
Why it's wrong here
Sensitivity labels classify data but do not automatically encrypt email attachments unless combined with other settings.
✓
Microsoft Purview Message Encryption
Why this is correct
Message Encryption encrypts email content and attachments, and allows control over forwarding and printing.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
Identify which MS-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Describe cloud concepts — This question tests Describe cloud concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Purview Message Encryption — Option A is correct because Microsoft Purview Message Encryption allows encrypting emails and attachments, and can restrict actions like forwarding. Option B is wrong because SharePoint external sharing controls access to SharePoint, not email attachments. Option C is wrong because DLP policies prevent sharing but do not protect after sending. Option D is wrong because sensitivity labels can be applied manually but do not automatically protect attachments in transit.
What should I do if I get this MS-900 question wrong?
Identify which MS-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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